FAQs for Filter Presses

This depends on your process. Cloth selection is as much an art as it is a science. Based on our 1,000 years of combined experience and lab testing, we can make an expert recommendation to you. We supply cloths based on criteria you give us and based on sample processing we do in our lab. Should your process change, we recommend that your cloth type be evaluated for suitability.

The company is the world’s best Filter Press Feed Pump Supplier supplier. We are your one-stop shop for all needs. Our staff are highly-specialized and will help you find the product you need.

The following is general information to help you understand cloths and how they work. For detailed questions, call our customer service department at 800.245.3006.

Cloths for non-gasketed plates are hung over the plate, extending from top to bottom, and are held in place by eyelets that fit over the cloth-pins on top of the plates. With the non-gasketed plate, the filter cloth provides the seal between the plates. Leakage will occur during operation even though Evoqua supplies the non-gasketed plate cloths with latex edging. The latex will cut down the wicking action somewhat, but will not eliminate it.

The gasketed plate allows less leakage than the non-gasketed plate due to an O-ring seal around the chamber and filtration ports. The gasketed cloth has a high-density sash cord sewn around the cloth's perimeter that is caulked into a groove on the plate.

The type of cloth used is determined by the type of process or application performed by the filter press, the operating environment, and the performance required by the filtering media (filter cloths).

The filter cloths come in many different materials including polypropylene, polyester, cotton, and other synthetic materials. The cloths are made from monofilament fibers, multifilament fibers, or spun fibers. The smooth surface characteristic of monofilament fibers can help to improve cake release properties. The uniform circumference of monofilaments also enables fabrics to be produced with consistent pore sizes. Multifilament and spun fibers are produced by twisting several smaller diameter monofilament fibers together into a single strand. They are used to produce fabrics that require a very tight weave and fabrics where high flow rates are not critical.

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Filter cloths also come in many different styles of fabric weave. ​

Mesh opening or pore size is also an important consideration when selecting the proper filter cloths for a particular application. The mesh opening or pore size is determined by the number of fibers, size of the fiber, and the type of weave. These factors in turn govern flow rates, particle retention, and the strength of the fabric itself. As shown below, these two fabrics, having the same type of open area, will have similar flow rates, but the fabric on the left will retain finer particles.

A Filter Press is composed of a support structure holding a series of recessed plates lined with filter cloths. Hydraulic pressure is used to hold the recessed plates tightly together, creating a seal around their perimeters and void spaces between the plates. A high-pressure slurry pump forces slurry into the empty chamber spaces between the plates for dewatering. The slurry solids are captured between the plates, while the clean filtrate water passes through the filter cloth mesh and exits through ports in the filter plates. When the chamber spaces are full of dewatered slurry solids, the slurry feed pump is automatically stopped. The hydraulic pressure holding the plates together is released so the plates can be separated individually, allowing the dewatered solid material cakes to fall by gravity out of the press.

Many people think the filter plates are squeezed together to expel water, but the press never moves during the time of dewatering. The only movements involved occur when the plates separate to expel the dry cakes or close to begin a new process cycle. Plates simply connect to form a seal under hydraulic pressure while the feed pump supplies the necessary pressure to dewater the fine solids.

Filter Presses are designed for simple and limited movement. This design leads to high-levels of automation and reliability. Compared to competing dewatering technologies, higher levels of water removal can be achieved with the Filter Press because the material being dewatered is captured between the recessed plates under the highest possible pump pressures. The Filter Press is also designed for the specific application by selecting the cycle times, cake thickness, feed pressures and plate styles to achieve optimum dewatering efficiencies.

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